It appears that a brand new update for the T-Mobile Galaxy S II subtly includes an “ISIS/NFC update.” If this update enables the ISIS service on the phone, it would make the Galaxy S II the first phone to utilize the Google-Wallet mobile payments competitor.

ISIS, if you happen to have forgotten, (no one would blame you, it was announced all the way back in 2010) is an NFC-based mobile wallet system backed by AT&T, T-Mobile, and Verizon.

Now it seems like things are finally coming to a head — Bloomberg reports that the ISIS payments system is expected to go live sometime next month, so expect more similar updates to roll out to other NFC-enabled devices sooner rather than later. In addition to support for the multi-carrier payments scheme, the update brings Galaxy S II owners nearly up to speed with access to Android 4.0.3 and includes a handful of bug fixes to boot. We’ve reached out to T-Mobile for some further clarification, but for now that’s about all we know.

Update: T-Mobile has responded with the following:

We have nothing to share at this time regarding Isis compatible products from T-Mobile, and we have nothing to add regarding the software update.